Magnetic controlling device.



No. 789,419. PATENTED MAY 9, 1905. U E. EVELETH & O. 0. RIDER,

MAGNETIC CONTROLLING DEVICE.

APPLICATION FILED JUNE 3,1903.

2 SHEETS-SHEET 1.

Inventors.

. v h a M e e M L E OS 6 PM a Fh OC w Witnesses No.789,419. PATENTED MAY9, 1905.- 0. E. EVELETH & 0. 0. RIDER.

MAGNETIC CONTROLLING DEVICE.

APPLICATION FILED JUNE 3,1903.

2 SHEETS-SHEET 2.

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B 6 Ma /refit Inventors wiflnesses. Oran Rider %,7 Charles E. Eveleth.

Patented May 9, 1905.

UNITED STATES PATENT OEEIcE.

CHARLES E. EVELETH AND ORAN O. RIDER, OF SCHENECTADY, NEIV YORK,ASSIGNORS TO GENERAL ELECTRIC COMPANY, A CORPORA- TION OF NEW YORK.

MAGNETIC CONTROLLING DEVICE.

SPECIFICATION forming part of Letters Patent No. 789,419, dated May 9,1905.

Application filed June 3,1903. Serial No. 159,845.

10 (all whom, it may concern:

Be it known that We, CHARLEs E. EvELETI-I and ORAN O. RIDER, citizens ofthe United States, residing at Schenectady, in the county of Schenectadyand State of New York, have invented certain new and useful Improvementsin Magnetic Controlling Devices, of which the followingis aspecification.

The present invention relates to magnetically-controlled apparatus, andmore particularly to devices of this class having means for adjustmentwhereby they are adapted for use under various loads and conditions ofservice.

As magnetic controlling devices have been constructed heretofore themethod of adjustment has consisted either in varying the length of theair-gap between the magnet members or in varying the amount of forceexerted to hold the magnet members in open position. The former methodis open to the objection that a wide calibration with a scale of equalsteps cannot be had, for the reason that the magnetic efiect isinversely proportioned to the square of the length of air-gap, and thelatter method is also objectionable, for the reason that the means forexerting the force to hold the parts in open position, usually anadjustable weight or spring, are diiiicult to manipulate and occupy muchvaluable space.

The object of our invention is to provide a convenient magneticcontrolling device having a wide range of calibration with equaldistances between the steps of calibration.

In carrying out our invention we provide one of the magnet members witha section of non-magnetic material to increase the reluctance to thelines of force and connect adjustably therewith a member of magneticmaterial adapted to shunt the lines of force around a greater or lesspart of the section of nonmagnetic material, and thereby vary the reluctance of the magnetic circuit.

The invention will be readily understood by reference to the followingdescription, taken in connection with the accompanying drawings, forminga part of this specification, in which Figure 1 is a side elevation of acircuitbreaker for use in connection with currents of large volumeprovided with a magnetic controlling device embodying one form of ourinvention. Fig. 2 shows in plan a stationary contact of thecircuit-breaker and the members of the magnetic controlling device inoperative relation therewith, and Fig. 3 is a perspective view of thecalibrated member of the device with the adjustable slide in positionthereon.

It is well known that if a bar of iron or other magnetic material bebrought into proximity to a current of electricity the magnetic lines offorce accompanying the electric current will pass into and through thebar, or, in other words, the bar will become magnetized. This principleis made use of in the present application of our invention as follows: AU-shaped bar A of soft iron or steel is provided, having a movablemember B pivoted thereto at one end, and the rectangular magneticconductor thus formed is placed about some current-carrying part of theapparatus to be controlled, such as a stationary contact C, with themovable member B normally held in open position by its own weight. Asthe current flowing through the conductor increases the magnetic flux inthe magnetic conductor members A and B increases correspondingly untilthe magnetic force between the parts A and B becomes suflicient to pickup the member B. The apparatus controlled has some part, such as atrip-lever I), held in the path of the movable member B, normallyoperating to hold the parts of the apparatus in operative position, butwhen engaged by the movable member B operates to release these parts andbreak the circuit.

In order that the magnetic members A and B may be adjusted to act underdifferent conditions or volumes of current, the reluctance or oppositionof these parts to the passage of magnetic lines of force is renderedadjustable by providing a section of their length with a non-magneticmaterial, such as brass, and mounting an iron slide thereon, which willconductively bridge the whole or a part of the section.

As shown in Figs. 2 and 3, the movable core member B is made in theshape of a prismatic bar 1, with hinge-lugs 2 2 projecting from itsopposite sides at one end, and extending upwardly above its upper edge,at its opposite end, are two spaced stop projections 3 3, and at aboutthe middle of its upper edge is provided a short contact elevation 4E.The bar is made up of three sections 5, 6, and T, brazed or weldedtogether. The left-hand section 5 embraces nearly half its length and isof iron or steel. The intermediate section 6 embraces nearly all theremaining half of the bar and is of brass or other non-magneticmaterial, and section 7 at the free end of the bar is relatively shortand of iron or steel. An adjustable slide 8, of magnetic material,embraces three sides of bar 1 for somewhat more than half its length andis provided with a thumb-screw 9, extending through one side andengaging a channel 10,formed in the side of the bar 1. When the slide isin its extreme right position, the section 6, of non-magnetic material,is entirely bridged thereby, and as a consequence the magnetic lines offorce traversing the bar will be shunted through the slide 8 around thesection 6, and by adjusting the slide 8 into positions to the left theshunting effect will be correspondingly reduced in proportion to thelength of non-magnetic material between the end of the slide 8 andsection 7 Bar 1 is accordingly calibrated to act at different loadsthatis to say, from live hundred to live thousand amperes or from twothousand live hundred to thirty thousand amperes, as the case may be. Ineither case the scale has approximately equal spaces between therespective steps, and ample room is provided in which the figures ofcalibration may be stamped.

The U-shaped conductor member A has its left-hand arm reduced at its endto enter between the lugs 2 2 of the movable conductor member B, towhich it is connected by a pin 11, and its righthand end is providedwith a right-angled projection 12, to which a rod 13 is secured. Therod13has a head 14, upon which the stop projections 3 3 of the movablemember normally rest, with the upper surface of the bar 1 slightly belowthe right end of member A.

In the application of the device shown in Fig. l the upper side of themember A is provided with an elongated bearing 15 for the reception of apivot-pin 16, to the ends of which a pair of links 17 areconnected,which links carry at their outer ends the fulcrumpin 18 of theoperating-lever 19. Near the lower ends of the member A bearings 20 and21 are provided,to which are pivoted the arms 22 of the movable contactmember 23. The trip-lever D is pivoted at 24 upon the arms 22 andextends at its lower end into proximity to the contact-surfacei of themovable conductor member B, and at its upper end it is provided with ashoulder 25, adapted to engage a catch 26, carried by the operatinglever19.

\Vhen the current passing through the circuit-breaker by way of contactsE, 23, and C exceeds a predetermined amount, the movable member B willbe drawn up from the position indicated in Fig. 2 into closed position,with the right-hand ends of the members A and B in contact. Thismovement of member B raises the lower end of the trip-lever D, causingit to release the lever 19 and permitting the circuit-breaker to springopen in the usual manner.

e do not wish to restrict ourselves to the "form of the parts or theapplication thereof shown in the drawings, since it is apparent thatthey may be changed and modiiied and used in connection with other formsof apparatus without departing from our invention.

What we claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. The combination with a magnetic coird uctor having a section ofnon-magnetic metal, of means to shunt lines of force about said.section.

2. The combination with a magnetic conductor having a section ofnon-magnetic metal, of adjustable means to shunt lines of force aboutsaid section.

3. The combination with a magnetic conductor comprising sections ofmagnetic and non-magnetic material integrally united, of 100 means toshunt lines of force about more or less of the section of non-magneticmaterial.

4. The combination with a magnetic conductor comprising two relativelymovable parts, one of which is provided with a section of non-magneticmetal, of means for shunting lines of force about said section.

5. The combination with a magnetic conductor comprising stationary andmovable members, one of which is provided with a section of non-magneticmaterial, of an adjustable part of magnetic material adapted to shuntlines of force about a greater or less portion of said section ofnon-magnetic material.

6. The combination with a magnetic conductor comprising stationary andmovable members, one of which is provided with a section of non-magneticmaterial, of an adjustable part'oi' magnetic material adapted to makecontact with said section of non-magnetic material and the magneticmaterial ol the member provided with said section, and means for holdingsaid part in adjusted position.

7. The combination with a magnetic conductor comprising stationary andmovable members, one of which is provided with a shunt lines oi forceabout a greater or less portion of said section.

in Witness whereof We have hereunto set our hands this 1st day of June,1903.

CHARLES E. EVELETH. ORAN O. RIDER.

\Vitnesses: Y

BENJAMIN B. HULL, HELEN ORFORD.

